With induction motors, we know that the speed depends on the number of poles and also the supply frequency. Now, the slipring motor is also an induction motor and should follow the same principles, but it doesn't and that confuses me.
Consider a slipring motor with resistor banks that are cut out of the rotor circuit in stages. At starting, the torque is much higher and gradually decreases as the resistance is lowered. But at the same time, the speed increases as the resistors are cut out of the rotor circuit.
How does this happen and why does it happen? Also, does this mean that the resistance of the rotor circuit affects the speed of the motor?
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